Multilayer polyarylene sulfide tubes

Abstract

Described here are multilayer tubes including a plurality of layers. The multilayer tubes include an outermost layer, including a first polyarylene sulfide (“PAS”) and from 5 wt. % to 30 wt. % of an impact modifier. The multilayer tubes also include an innermost layer including a second PAS and from 0.1 wt. % to 10 wt. % of an electrically conductive filler. Significantly, each layer in the multilayer tube comprises a PAS. The outermost layer is the sole layer comprising an impact modifier and the innermost layer is the sole layer comprising an electrically conductive filler. At least in part because of compatibility of PAS based materials with one another for interfacial bonding, the multilayer tube is free of tie layers.

1 . A multilayer tube comprising a plurality of layers and including:
 an outermost layer comprising:
 a first polyarylene sulfide (“PAS”) and 
 10 wt. % to 40 wt. % of an impact modifier, and 
   an innermost layer comprising:
 a second PAS and 
 0.1 wt. % to 5 wt. % of an electrically conductive filler, 
   
       wherein
 each layer in the multilayer tube comprises a PAS; 
 the outermost layer is the sole layer comprising an impact modifier; and 
 the innermost layer is the sole layer comprising an electrically conductive filler. 
 
     
     
         2 . The multilayer tube of  claim 1 , wherein the first PAS and the second PAS are independently represented by the following formula (1): 
       
         
           
           
               
               
           
         
       
       wherein, R, at each instance, is independently selected from the group consisting of a C 1 -C 12  alkyl group, a C 7 -C 24  alkylaryl group, a C 7 -C 24  aralkyl group, a C 6 -C 24  arylene group, and a C 6 -C 18  aryloxy group and i is an independently selected integer from 0 to 4; and j, at each instance, is an independently selected integer from 0 to 3. 
     
     
         3 . The multilayer tube of  claim 1 , wherein the first PAS is the same as the second PAS. 
     
     
         4 . The multilayer tube of  claim 1 , wherein the outermost layer consists essentially of the first PAS and the 10 wt. % to 40 wt. % of the impact modifier. 
     
     
         5 . The multilayer tube of  claim 1 , wherein the innermost layer consists essentially of the second PAS and the 0.1 wt. % to 5 wt. % or an electrically conductive filler. 
     
     
         6 . The multilayer tube of  claim 1 , wherein the outermost layer and the innermost layer are the sole layers. 
     
     
         7 . The multilayer tube of  claim 1 , wherein the outermost layer has a thickness of from 0.1 mm to no more than 10 mm and the inner most layer has a thickness of from 10 μm to no more than 1500 μm. 
     
     
         8 . The multilayer tube of  claim 1 , further comprising an intermediate layer in contact with the outermost layer and innermost layer, the intermediate layer comprising a third PAS. 
     
     
         9 . The multilayer tube of  claim 8 , wherein the third PAS is independently represented by formula (1). 
     
     
         10 . The multilayer tube of  claim 8 , wherein the first PAS, the second PAS and the third PAS are the same. 
     
     
         11 . The multilayer tube of  claim 8 , wherein the intermediate layer consists essentially of the third PAS. 
     
     
         12 . The multilayer tube of  claim 8 , wherein the intermediate layer has a thickness of from 10 μm to no more than 1500 μm. 
     
     
         13 . The multilayer tube of  claim 1 , wherein the impact modifier is an ethylene/Methyl acrylate/glycidyl methacrylate copolymer. 
     
     
         14 . The multilayer tube of  claim 1 , wherein the electrically conductive filler is carbon nanotubes, preferably, single-walled carbon nanotubes. 
     
     
         15 . A method of forming a multilayer tube comprising a plurality of layers and including:
 an outermost layer comprising:
 a first polyarylene sulfide (“PAS”) and 
 10 wt. % to 40 wt. % of an impact modifier, and 
   an innermost layer comprising:
 a second PAS and 
 0.1 wt. % to 5 wt. % of an electrically conductive filler, 
   
       wherein
 each layer in the multilayer tube comprises a PAS; 
 the outermost layer is the sole layer comprising an impact modifier; and 
 
       the innermost layer is the sole layer comprising an electrically conductive filler, the method comprising co-extruding the outermost layer and the innermost layer to form the multilayer tube.